Cutter for sound-reproducing styli.



JAP

" E. R. JOHNSON.

CUTTER FOR SOUND REPRODUCING STYLI. APPLICATION man novt le, 1912,

Patented June 12, 1917.

.65 izg 50 Q 0 J8 45% 35 @I a@ '7, l Il 0 3@ 25 mz nenn: l-zgms cm.Nam-urna, msnmswu. n a

INVENTOR ATTORNEY n'rran srnrns rnfrnnr oriana.

'ELDRIDGE B. JOHNSON, OF MERION, PENNSYLVANIA, ASSIGNOR TO VICTORTALKING MACHINE COMPAN-Y, rA CORPORATION F NEW JERSEY.

CUTLIECR- FOB SOUND-REPRODUCING STYLI.

Specification of Letters Patent.

Patented J une 12, 1917.

Application filed November 18, 1912. Serial No. 731,955.

` To all whom t hwy concern:

Be it known that I, ELDRIDGE R. JOHNSON, a citizen of the United States,and a resident of Merion, county of Montgomery, State of Pennsylvania,have invented certain new and useful Improvements in Cutters forSoundReproducing Styli, whereof the following is a specification,reference being had to the accompanying drawings.

This invention particularly relates to .devices for cutting orre-sharpening sound reproducing styli and is especially directed torc-pointing styli formed of vegetableiiber or other similaff yr suitablematerial.

The objects t; this invention are to provide a simple and efficientstylus cutter with coperating cutting blades adapted to'shear a stylus,including a stationary shearing blade and a movable cutting bladedisposed in a relatively angular position with respect ,to saidstationary blade and adjustably mounted on a pivoted lever adapted tomovably support the cutting blade and yielding means tending toautomatically shift said lever to its inoperative position to separatethe blades. Further objects of this invention are to provide adjustablemeans to vary the tension of the movable blade to adord different.degrees of frictional` engagement between the stationary and movableblades so thatV the apparatus may bevadjusted and maintained inaposition to make a clean cut at the end of a used stylus needle toethciently resharpen the same.

In the accompanying drawing, Figure 1 is a longitudinal sectionalelevation of a stylus cutter showing a convenient embodiment of thisinvention; Fig. 2 is a'plan view of the stylus cutter shown in Fig. 1;Fig. 3 is a front elevational view of said stylus cutter; Fig. a is afragmentary sectional view taken on the line 4-4 in Fig. 3; Fig. 5 is afragmentary perspective view ofthe supporting block showing "the,inclined diagonal channel for directing the stylusr needle between thecoperative cutting blades; Fig. 6 is a perspective view of the pivotedlever carrying the movable cutting blade; and Fig. 7 is a perspectiveview of a triangular ber needle. j

In said drawings, the base plate 10 is provided with the Aperimetralflange 11 projecting upwardly and forming a receptacle 12 fortheshavings or chips sheared 'from the.

stylus needles, and is also provided with a supporting block 14,preferably integral with the base-plate 10 and having an inclineddiagonally disposed slot 15 forming a guide for directing the stylusneedles to be cut toward the-stationary shearing or cutting blade 16.Said stationary blade 16 is preferably flat and is suitably supported Yin aV vertical plane on said supporting block 14 by the set screws 17and 18 respectively extending through vertical slots 19 and 2O i in saidblade, which permits the vertical adjustinent of said bla e with respectto said supporting block 14.

To the supporting block 1li is secured the standard plate 22 whichcarries the pivoted lever or support 23 mounted for oscillation upon theshaft 24and retained thereon by the head 25. Said lever 23 is providedat its free end with a thumb plate 26 by which plane of the stationaryshearing blade 16 and is provided with an upwardly extend ing lug 31which is bent backwardly into an oblique plane intersecting the plane ofsaidv shearing blade 16, andcarries the mov able cutting blade 32 whichis secured to said upwardly extending lug 31 by the set screw 33, whichextends through the slot 34 in said cutting blade 32, and is in threadedengagement with said lug 31. The cutting blade 32 projects downwardlyfrom the lug 31 and the lower portion of the blade projects from theV`Side of the lever 23 and is provided at its lower end with a sharpcutting edge 35 which is preferably longitudinally straight andtransversely acute. The cut ting edge 35 of this movablecutting blade 32may be yieldingly pressed into engagement with-,the flat vertical sideof the stationary shearing blade' 16 by the adjusting screw 38, which isin threaded engagement with the pivoted lever 23, and has the reducedprojection 39 extending through the slot 40 in said movable blade. Theprojection `39 provides a shoulder L11 bearing against the inner surfaceof the cutting blade 32, whereby said cutting blade 32 may be flexed orsprung as desired'to vary the tension and consequently the lf'rictionalengagement with said stationary blade 16, which is provided withyupwardly extending portions 44 and 45 disposed upon opposite sides ofits sharpened edge Ii6 for the engagement of said cutting edge of saidmovableblade when separated from the cutting edge of the stationaryblade, and for yguiding the cutting edge'of the movable blade 32 intocooperative engagement with the cutting edge of said stationary blade16.

rI he pivoted lever 23 is also provided with a projecting finger 50,which extendsV therefrom generally in the direction of thefree end ofsaid lever, and is bent inwardly into a plane adjacent to the plane ofthe stationary shearing blade 16, and whensaid lever is initsinoperative position to separate the blades, said finger is tdisposedacross the inner end of the diagonally inclined channel 15, and in thepath of the stylus needle 51 which may be guided by said'ohannel, andwhich is limited in its inward movement by said finger 50 which, as willbeV readily seen by reference tothe dotted line position shown in Fig.1, is moved away from the end of the stylusneedle as the free end of thelever ispressed downwardlyby the operator, to e ect the shearing of theend 52 of said needle. By reason of the withdrawal of said finger,e itwill be seen that the shaving or chip of stylus sheared by thecooperation of the blades is free toV be ejected from said blades and tobe collected in the receptacle 12 provided therefor in the base plate10.

Said pivoted lever 23 is provided with'the Vslot 53 which is coperativewith the head of the screw 54 which extends into said slot and which isin threaded engagement with the standard plate 22 to limit the movementof oscillation` of the pivoted lever 23, asbest shown in Fig. 1. f

The base plate-10 may be preferably provided on its bottom surface witha facing 55 of felt, leather or other suitable material for preventingthe device from' scratching any surface upon rwhich it may be supported.

' The cutter above described operates as follows: YA stylus needle,preferably of trianf gular cross-section, as shown in Fig. 7', isinserted in the channel 15 with one of its sides resting on the bottomofsaid channel, and is forced into engagement with the linger 50, andheld preferably by the thumb of the left hand of the operator, who,'atthe same time,

with his right hand presses the free end of the pivoted lever 23downwardly as indicated by the arrow in Fig. 3, to theposition Copies ofthis patent may be obtained for shown in dotted lines in Fig. 1, whichmovement ofthe lever 23 forces the cutting edge of the movable cuttingblade 32 down into coperative engagement'with the shearing edge of thestationary shearing blade 16, and removes a shaving or chip from the endof the stylus needle, ofV a thickness equal to the space between theplane Vof the shearing` edge of the stationary shearing blade 16 and theplane of the adjacent surface of the finger 50, which shaving, byvirtuel of the fact that' the linger is shifted Clear of the end ofthestylus needle when the blades are actuated, 75 is freely ejected fromsaid blades and per` vmitted to drop into the receptacle 12 providedtherefor in the base plate 10.

It will be readily seen that by reason of the fact that the movablecutting blade is disposed at an angle with respect to the plane of thestationary shearing bladeV 16, andv is adjustable to vary thefrictionalcontact therewith, a clean cut ofthe end of the stylus'needle is readilyafforded, and that by virtue of the nger 50vr being normallymaintained'in a positionto stop the needle thrust into the channel 15,when the blades areseparated a uniform chip or shaving will be insured.f.

lt is not desired to limit this invention to the precise detailsofVconstructionand arrangement herein set forth, asvarious modificationsmay be made therein without departing from the essential features of the95 invention as defined in the appended claim.

Having thus described my invention, I claim: Y. A

In a stylus cutter,the combination of a stationary blade having acutting edge and 100 a guiding surface flush with the active edge ofsaid blade and extending on ak side of the Vcutting edge of saidstationary blade, a

blade carrier mounted to move in a plane substantially parallel to thesaid Vguiding surface of said stationary blade, a cutting blade securedto said carrier and disposed in a plane making a slight angle with theplane vof said guiding surface of said stationary blade, said blade onsaid carrier being relatively long and having one of its short endssecured to sai-d carrier kand its opposite short end provided with acutting edge, and means carried by said carrier and disposedbetween saidblade and said carrier to fieX said blade laterally to adjust andregulate the pressure betweenV said blades. L

In witness whereof, I have hereunto set my hand this 15th day ofNovember, 1912./

- VELDRIDGnE R. J OHNSON.Y

Witnesses:

FRANK B. MIDDLETON, Jr., HARRY COBB KENNEDY.y

vefcentseach, by addressing the Commissioner of Patents, Washington, D.C. f

